EP1070861B1 - Coated fastener inserts and method of producing the same - Google Patents
Coated fastener inserts and method of producing the same Download PDFInfo
- Publication number
- EP1070861B1 EP1070861B1 EP00306143A EP00306143A EP1070861B1 EP 1070861 B1 EP1070861 B1 EP 1070861B1 EP 00306143 A EP00306143 A EP 00306143A EP 00306143 A EP00306143 A EP 00306143A EP 1070861 B1 EP1070861 B1 EP 1070861B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fastener
- insert
- coating
- coated
- cylindrical body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 23
- 238000000576 coating method Methods 0.000 claims abstract description 23
- 229920002313 fluoropolymer Polymers 0.000 claims abstract description 13
- 239000004811 fluoropolymer Substances 0.000 claims abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000011342 resin composition Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000007598 dipping method Methods 0.000 claims 1
- 229910001092 metal group alloy Inorganic materials 0.000 claims 1
- 230000000712 assembly Effects 0.000 abstract description 7
- 238000000429 assembly Methods 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 2
- 229920005989 resin Polymers 0.000 abstract description 2
- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 5
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 229920001221 xylan Polymers 0.000 description 3
- 150000004823 xylans Chemical class 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- -1 i.e. Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 239000004446 fluoropolymer coating Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910001463 metal phosphate Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
- F16B37/12—Nuts or like thread-engaging members with thread-engaging surfaces formed by inserted coil-springs, discs, or the like; Independent pieces of wound wire used as nuts; Threaded inserts for holes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/004—Sealing; Insulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/90—Fastener or fastener element composed of plural different materials
- Y10S411/901—Core and exterior of different materials
- Y10S411/902—Metal core
- Y10S411/903—Resinous exterior
Definitions
- the present invention relates to coated fastener inserts and a method for coating such fastener inserts and, more particularly, to coating fastener inserts to prevent the galvanic corrosion in fastener assemblies.
- Fastener assemblies come in a variety of shapes, sizes, designs and materials. Many fastener assemblies include not only a fastener such as a bolt, pin or screw, but also will include a fastener insert to be positioned within a tapped hole.
- tapped threads are strengthened due to the inherent flexibility of helically coiled wire inserts since the insert provides a more balanced distribution of dynamic and static loads throughout the length of thread engagement. This is especially important when the substrate including tapped holes is formed from a relatively soft metal, i.e., aluminum and magnesium. The inherent flexibility also compensates for variation in lead and angle error.
- Helically coiled wire inserts allow for the use of smaller bosses, flanges and fasteners than other inserts, thus presenting a cost savings, particularly for high volume applications.
- helically coiled wire inserts are generally useful as anchoring mechanisms for threaded fasteners in order to be used in high strength applications, such inserts must be formed from high strength metals such as 302/304 stainless steel.
- high strength metals such as 302/304 stainless steel.
- the use of stainless steel inserts in association with substrates or fasteners formed from other alloys leads to certain perceived problems such as the possibility of galvanic corrosion occurring over time.
- galvanic corrosion it is meant the electrochemical corrosion resulting from the current caused in a galvanic cell between two dissimilar metals in an electrolyte because of the difference in potential (emf) of the two metals.
- Stainless steel fastener inserts have been coated with zinc chromate in an effort to prevent galvanic corrosion.
- application of the zinc chromate requires strict quantitative controls and is considered labor intensive.
- the application of too much zinc chromate can restrict movement.
- the installation tools would require frequent cleaning to prevent build up of the zinc chromate on mandrels of the tool which is undesirable.
- the application of too little zinc chromate leads to certain other problems such as inadequate corrosion protection, for example.
- a metallic fastener insert according to the preamble of claim 1 is disclosed in GB-A-536 959 .
- the present invention relates to a coated metallic fastener insert for securing a fastener within a tapped hole of a metallic substrate, said insert being formed from a high strength metal, in particular stainless steel, and comprising:
- the present invention further relates to a method of producing a fastener insert for securing a threaded fastener within a tapped hole of a metallic substrate, which insert is resistant to galvanic corrosion in use, said method comprising the steps of
- a fastener assembly 10 for use in association with a substrate 12 having one or more tapped holes 14 including inwardly projecting threads 16.
- the fastener assembly 10 includes a fastener 20 and fastener insert 22 insertable within the tapped hole 14.
- the fastener 20 generally includes a head 24 and a shank 26 having radially outwardly projecting threads 28.
- the fastener insert 22 may be of any form capable of retaining the fastener within a tapped hole but preferably is in the form of a helically wound wire 30 including a body 32 having a plurality of convolutions 34 disposed between first and second ends, 36 and 38, respectively. At least one of the ends may be provided with a driving tang or notch for tangless embodiments for assistance in the installation or removal process.
- the fastener inserts 22 are larger in diameter, before installation than the tapped holes 14 such that upon installation they become firmly secured within the tapped holes, as shown most clearly in Fig. 2 .
- the coils provide permanent convolution 60° internal screw threads which accommodate virtually any standard threaded bolt or screw.
- the insert Prior to inserting the fastener insert 22 within the tapped hole 14, the insert is coated with a resin bonded fluoropolymer composition such as XYLAN® 5251, available from Whitford Corporation of Westchester, Pennsylvania or E/M® 6219, which is available from Engineered Coating Solutions, Inc. of Peachtree City, Georgia, by way of non-limiting example.
- a resin bonded fluoropolymer composition such as XYLAN® 5251, available from Whitford Corporation of Westchester, Pennsylvania or E/M® 6219, which is available from Engineered Coating Solutions, Inc. of Peachtree City, Georgia, by way of non-limiting example.
- the composition be thoroughly agitated such that the fluoropolymer is adequately dispersed in solution.
- the fluoropolymer composition may be applied via dip spin or air spray techniques.
- the fluoropolymer composition may also serve to reduce galling. It is preferred that the dry film thickness be in the range of between 0,762 to about 12,7 ⁇ m. (0.03 to about 0.5 mils). As such, it is preferred that under dip spin applications that at least two coats are applied to obtain the preferred thickness. Using conventional spray application techniques, a single coat of between about 15,24 to 25,4 ⁇ m (0.6 to 1.0 mils.) is possible.
- a preferred viscosity is generally in the range of between about 20 - 30 seconds at 25°C.
- the fastener inserts be free of contaminants such as oil, grease, metal shavings, etc., since contaminants may cause poor adhesion of the coating to the fastener insert or defects in the dry coating composition.
- the fastener inserts be cleaned, i.e., degreased prior to coating using a chlorinated or fluorinated solvent, detergents, or a high temperature burnout process wherein the part is exposed to temperatures roughly between 400 to 425°C for ten to twenty minutes to ensure that any petroleum based contaminants are fully carbonized.
- each fastener insert should be solvent rinsed to flush out any grit residue.
- the fastener inserts be pre-treated with a primer which is heat stable calcium or magnesium modified phosphate having a relatively fine crystalline structure.
- a primer which is heat stable calcium or magnesium modified phosphate having a relatively fine crystalline structure.
- Commercially available compositions which are useful as primers include Aerocoat #3 available from Aerocoat Corporation of Houston, Texas and Whitford's XYLAN® P-5211 primer or XYLAN® P-5212 primer, particularly wherein the fastener assembly will be subjected to acid rain conditions.
- each fastener insert is dipped for between about five to ten seconds and subsequently spun for five to fifteen seconds in each direction changing direction at least three times. Thereafter, the fastener insert is cured for between about 7 to 10 minutes at temperatures of between about 190°C to about 240°C. The part is preferably allowed to cool to ambient temperatures of less than about 38°C prior to carrying out the aforementioned dip spinning steps to apply the second coat.
- Air spray techniques generally involve application at line pressures of between 276 to 345 kPa (40 to 50 psi) and pop pressures in the range of between 20,7 to 48,3 kPa (3 to 7 psi) at ambient temperatures of less than about 38°C.
- the fastener inserts are cured for between about 7 to 10 minutes at temperatures of between about 180°C to about 240°C.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
Abstract
Description
- The present invention relates to coated fastener inserts and a method for coating such fastener inserts and, more particularly, to coating fastener inserts to prevent the galvanic corrosion in fastener assemblies.
- Fastener assemblies come in a variety of shapes, sizes, designs and materials. Many fastener assemblies include not only a fastener such as a bolt, pin or screw, but also will include a fastener insert to be positioned within a tapped hole.
- The type of fastener insert needed for a particular fastening operation will in large part dictated the type of fastener to be employed. While the present invention is applicable to various fastener assemblies wherein galvanic corrosion is a potential problem, the invention will hereinafter be described with reference to fastener assemblies with metallic helically coiled wire fastener inserts. By way of non-limiting example, certain metallic helically coiled wire inserts useful in association with a threaded fastener is described in
U.S. Patent No. 2,672,070 entitled Wire Coil Screw Thread Insert for Molded Material. Other fastener inserts which can be coated in accordance with the teachings of the present invention are described inU.S. Patent Nos. 2,512,316 ;2,586,007 ;2,708,265 ;2,755,699 ;2,874,741 ;2,934,123 ;3,018,684 , each of which is expressly incorporated by reference. - Generally speaking, tapped threads are strengthened due to the inherent flexibility of helically coiled wire inserts since the insert provides a more balanced distribution of dynamic and static loads throughout the length of thread engagement. This is especially important when the substrate including tapped holes is formed from a relatively soft metal, i.e., aluminum and magnesium. The inherent flexibility also compensates for variation in lead and angle error.
- Additionally, no stress is initially introduced to the substrate because the helically coiled insert does not exhibit staking, locking or swaying and does not require keying in place. Helically coiled wire inserts allow for the use of smaller bosses, flanges and fasteners than other inserts, thus presenting a cost savings, particularly for high volume applications.
- While such helically coiled wire inserts are generally useful as anchoring mechanisms for threaded fasteners in order to be used in high strength applications, such inserts must be formed from high strength metals such as 302/304 stainless steel. The use of stainless steel inserts in association with substrates or fasteners formed from other alloys leads to certain perceived problems such as the possibility of galvanic corrosion occurring over time. By the phrase "galvanic corrosion", it is meant the electrochemical corrosion resulting from the current caused in a galvanic cell between two dissimilar metals in an electrolyte because of the difference in potential (emf) of the two metals.
- Stainless steel fastener inserts have been coated with zinc chromate in an effort to prevent galvanic corrosion. However, application of the zinc chromate requires strict quantitative controls and is considered labor intensive. The application of too much zinc chromate can restrict movement. Additionally, the installation tools would require frequent cleaning to prevent build up of the zinc chromate on mandrels of the tool which is undesirable. The application of too little zinc chromate leads to certain other problems such as inadequate corrosion protection, for example.
- A metallic fastener insert according to the preamble of claim 1 is disclosed in
GB-A-536 959 - From
FR-A-2051891 US-A-4074011 teaches to first coat bolts, nuts and washers with an undercoat consisting of metal phosphate, and with a top coating consisting of a chromium compound and one or more of a metal salt of higher fatty acid, polyolefin and polytetrafluoride dissolved or dispersed in a vehicle. - In view of the foregoing, it is an object of the present invention to prevent galvanic corrosion in fastener assemblies employing a metallic fastener insert and a fastener for use in a tapped hole.
- The present invention relates to a coated metallic fastener insert for securing a fastener within a tapped hole of a metallic substrate, said insert being formed from a high strength metal, in particular stainless steel, and comprising:
- a substantially cylindrical body of helically wound wire including a plurality of convolutions providing internal screw threads upon insertion within the inwardly projecting threads of the tapped hole, wherein the cylindrical body has a larger diameter before installation than the tapped hole, and the entire exterior surface is coated with a resin composition with dispersed fluoropolymer, and wherein said coating has an average dry thickness of between about 0,762 to 12,7 µm (0.3 to 0.5 mils).
- The present invention further relates to a method of producing a fastener insert for securing a threaded fastener within a tapped hole of a metallic substrate, which insert is resistant to galvanic corrosion in use, said method comprising the steps of
- a) forming a substantially cylindrical body of helically wound wire including a plurality of convolutions from a high strength metal such as stainless steel, the cylindrical body having a larger diameter before installation than the tapped hole; and
- b) coating the entire surface of said cylindrical body with a resin composition with dispersed fluoropolymer, wherein said coating applied to said fastener insert has an average dry thickness of between about 0,762 to 12,7 µm.
- As a result of coating the fastener insert, it is a primary object of the present invention to extend the useful life of fastener applications by preventing galvanic corrosion within a fastener assembly.
-
Fig. 1 is a blown apart perspective view of a fastener assembly including a helically wound insert; -
Fig. 2 is an assembly view in cross-section of the fastener assembly ofFig. 1 ; -
Fig. 3 is a perspective view illustrating the spray coating of a helically wound insert; -
Fig. 4 is a perspective view illustrating the dip coating of a helically wound insert; and -
Fig. 5 is a cross-sectional view of a convolution taken along line 5-5 ofFig. 1 of a coated fastener insert. - Referring to
Fig. 1 , there is shown afastener assembly 10 for use in association with asubstrate 12 having one or more tappedholes 14 including inwardly projectingthreads 16. Thefastener assembly 10 includes afastener 20 and fastener insert 22 insertable within the tappedhole 14. - The
fastener 20 generally includes ahead 24 and ashank 26 having radially outwardly projectingthreads 28. The fastener insert 22 may be of any form capable of retaining the fastener within a tapped hole but preferably is in the form of a helically woundwire 30 including abody 32 having a plurality ofconvolutions 34 disposed between first and second ends, 36 and 38, respectively. At least one of the ends may be provided with a driving tang or notch for tangless embodiments for assistance in the installation or removal process. - Preferably, the
fastener inserts 22 are larger in diameter, before installation than the tappedholes 14 such that upon installation they become firmly secured within the tapped holes, as shown most clearly inFig. 2 . Further, when the helically wound inserts are disposed within the tapped holes, the coils provide permanent convolution 60° internal screw threads which accommodate virtually any standard threaded bolt or screw. - Prior to inserting the fastener insert 22 within the tapped
hole 14, the insert is coated with a resin bonded fluoropolymer composition such as XYLAN® 5251, available from Whitford Corporation of Westchester, Pennsylvania or E/M® 6219, which is available from Engineered Coating Solutions, Inc. of Peachtree City, Georgia, by way of non-limiting example. Before applying the fluoropolymer coating, it is preferred that the composition be thoroughly agitated such that the fluoropolymer is adequately dispersed in solution. - As illustrated with reference to
Figs. 3 and 4 , the fluoropolymer composition may be applied via dip spin or air spray techniques. In addition to the prevention of galvanic corrosion to which this invention is particularly directed, when the fastener insert is formed from a stainless steel, the fluoropolymer composition may also serve to reduce galling. It is preferred that the dry film thickness be in the range of between 0,762 to about 12,7 µm. (0.03 to about 0.5 mils). As such, it is preferred that under dip spin applications that at least two coats are applied to obtain the preferred thickness. Using conventional spray application techniques, a single coat of between about 15,24 to 25,4 µm (0.6 to 1.0 mils.) is possible. - Under certain circumstances it may be necessary to modify the viscosity of the fluoropolymer composition by admixing with a solvent such as methylethylketone (mek) until the desired viscosity is obtained. A preferred viscosity is generally in the range of between about 20 - 30 seconds at 25°C.
- As noted above, it is preferred that the fastener inserts be free of contaminants such as oil, grease, metal shavings, etc., since contaminants may cause poor adhesion of the coating to the fastener insert or defects in the dry coating composition. Thus, it is recommended that the fastener inserts be cleaned, i.e., degreased prior to coating using a chlorinated or fluorinated solvent, detergents, or a high temperature burnout process wherein the part is exposed to temperatures roughly between 400 to 425°C for ten to twenty minutes to ensure that any petroleum based contaminants are fully carbonized.
- In addition to cleaning the surface, it is also recommended that the fastener inserts be abraded utilizing conventional techniques such as grit and/or sand blasting. Recommended grit sizes are between about 0,18 to 0,13 mm (80 to 120 mesh) at an air pressure of about 550 kPa (80 pounds per square inch). Once the abrading step has been carried out, each fastener insert should be solvent rinsed to flush out any grit residue.
- Optionally, particularly for applications wherein the fastener assembly is susceptible to harsh environmental conditions, it is preferred that the fastener inserts be pre-treated with a primer which is heat stable calcium or magnesium modified phosphate having a relatively fine crystalline structure. Commercially available compositions which are useful as primers include Aerocoat #3 available from Aerocoat Corporation of Houston, Texas and Whitford's XYLAN® P-5211 primer or XYLAN® P-5212 primer, particularly wherein the fastener assembly will be subjected to acid rain conditions.
- To carry out a dip spin application, each fastener insert is dipped for between about five to ten seconds and subsequently spun for five to fifteen seconds in each direction changing direction at least three times. Thereafter, the fastener insert is cured for between about 7 to 10 minutes at temperatures of between about 190°C to about 240°C. The part is preferably allowed to cool to ambient temperatures of less than about 38°C prior to carrying out the aforementioned dip spinning steps to apply the second coat.
- Air spray techniques generally involve application at line pressures of between 276 to 345 kPa (40 to 50 psi) and pop pressures in the range of between 20,7 to 48,3 kPa (3 to 7 psi) at ambient temperatures of less than about 38°C. Following the application of the fluoropolymer composition, the fastener inserts are cured for between about 7 to 10 minutes at temperatures of between about 180°C to about 240°C.
- Upon fully curing the coating upon the fastener inserts quality control in the form of a visual inspection should be carried out. If bridging of the coating between adjacent coils is present, such coils should be rejected.
Claims (14)
- A metallic fastener insert (22) for securing a threaded fastener (20) within a tapped hole (14) of a metallic substrate (12), said insert (22) being formed from a high strength metal, and comprising:a substantially cylindrical body (32) of helically wound wire (30) including a plurality of convolutions (34) providing internal screw threads upon insertion within the tapped hole (14) including inwardly projecting threads (16),the cylindrical body (32) having a larger diameter before installation than the tapped hole (14), characterised in thatthe entire surface of said cylindrical body (32) is coated with a resin composition with dispersed fluoropolymer, wherein said coating has an average dry thickness of between about 0,762 to 12,7 µm.
- The coated metallic fastener insert of Claim 1 wherein said the coils of said insert (22) provide permanent convolution 60° internal screw threads upon insertion within a tapped hole (14).
- The coated metallic fastener insert of Claim 1 wherein said insert (22) is formed from a stainless steel.
- The coated metallic fastener insert of Claim 1 wherein said fastener insert is pre-coated with a primer prior to the application of said fluoropolymer composition coating.
- A fastener assembly including a coated metallic fastener insert (22) according to one of the preceding claims, a metallic fastener (20) and a metallic substrate (12) including a tapped hole (14) with inwardly projecting threads (16), for receiving said insert (22) and said fastener (20), said insert (22) having a larger diameter before installation than the tapped hole (14) and being from a metal alloy which is different from the metal of said fastener (20) or substrate (12).
- A method of producing a fastener insert (22) for securing a threaded fastener (20) within a tapped hole (14) of a metallic substrate (12), which insert is resistant to galvanic corrosion in use, said method comprising the steps of:a) forming a substantially cylindrical body (32) of helically wound wire (30) including a plurality of convolutions (34) from a high strength metal, in particular stainless steel, the cylindrical body having a larger diameter before installation than the tapped hole (14); andb) coating the entire surface of said cylindrical body (32) with a resin composition with dispersed fluoropolymer, wherein said coating applied to said fastener insert has an average dry thickness of between about 0,762 to 12,7 µm.
- The method of Claim 6 wherein said fastener insert is cleaned prior to being coated.
- The method of Claim 6 wherein said fastener insert is abraded prior to being coated.
- The method of Claim 6 wherein said fastener insert is optionally pre-coated with a primer prior to applying said coating.
- The method of Claim 6, wherein said coating is applied via a dip spin technique.
- The method of Claim 10 wherein said coating is applied by dipping said cylindrical body in a dispersed solution of the fluoropolymer composition for between about 5 to 10 seconds, subsequently spinning said cylindrical body for 5 to 15 seconds in each direction at least three times, and then curing said cylindrical body.
- The method of Claim 10 wherein said coating is applied in multiple layers.
- The method of Claim 6 wherein said coating is applied via spraying.
- The method of Claim 6 wherein said coating is cured upon said fastener insert by baking at a temperature of between about 180°C to about 240°C.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/356,988 US6224311B1 (en) | 1999-07-20 | 1999-07-20 | Coated fastener inserts and method of producing the same |
US356988 | 1999-07-20 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1070861A2 EP1070861A2 (en) | 2001-01-24 |
EP1070861A3 EP1070861A3 (en) | 2003-04-23 |
EP1070861B1 true EP1070861B1 (en) | 2009-05-20 |
Family
ID=23403826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00306143A Expired - Lifetime EP1070861B1 (en) | 1999-07-20 | 2000-07-19 | Coated fastener inserts and method of producing the same |
Country Status (5)
Country | Link |
---|---|
US (1) | US6224311B1 (en) |
EP (1) | EP1070861B1 (en) |
JP (1) | JP2001059510A (en) |
AT (1) | ATE431909T1 (en) |
DE (1) | DE60042228D1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6726422B2 (en) * | 2001-11-02 | 2004-04-27 | Newfrey Llc | Helically coiled titanium wire fastener inserts |
US20030190213A1 (en) * | 2002-04-04 | 2003-10-09 | Lutkus William J. | Plated fastener inserts and method of producing the same |
US20040020953A1 (en) * | 2002-08-02 | 2004-02-05 | Ed Kopidlansky | Motorcycle luggage rack system |
US20040240188A1 (en) * | 2003-05-28 | 2004-12-02 | Cromwell Stephen Daniel | Protective coating for attach hardware for circuits |
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DE202004009409U1 (en) * | 2004-06-15 | 2004-08-12 | Böllhoff Verbindungstechnik GmbH | Wire thread insert made of magnesium or aluminum alloy |
US20070054052A1 (en) * | 2005-06-01 | 2007-03-08 | Gregory Alaimo | Fluoropolymer coating compositions for threaded fasteners |
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US20070292238A1 (en) * | 2006-06-19 | 2007-12-20 | Simon James Bowen | Thread forming wire thread insert |
EP1898107A1 (en) * | 2006-09-06 | 2008-03-12 | Bofag Fastener AG | Procedure for installing a screw and an threaded insert as well as arrangement for accomplishing the procedure |
US7935138B1 (en) | 2010-07-28 | 2011-05-03 | Richelsoph Marc E | Active bone screw |
FR2989144B1 (en) * | 2012-04-04 | 2014-05-09 | Technip France | ASSEMBLY OF A FLEXIBLE TUBULAR CONDUIT FOR TRANSPORTING HYDROCARBON FLUIDS WITH A SECONDARY METAL TUBE |
US11821498B2 (en) * | 2021-09-28 | 2023-11-21 | Hamilton Sundstrand Corporation | Polymeric thread insert for high load leadscrew and nut |
WO2023244261A1 (en) * | 2022-06-16 | 2023-12-21 | Howmet Aerospace Inc. | Blind fastener |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB900672A (en) * | 1959-04-16 | 1962-07-11 | Yokohoma Rubber Company Ltd | Improved fastening assembly |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1411410A (en) * | 1964-10-12 | 1965-09-17 | Process in particular for coating penetrating or joining elements as well as elements conforming to those obtained by the present process or similar process | |
US3960610A (en) * | 1966-06-01 | 1976-06-01 | Amchem Products, Inc. | Process for coating metals |
US3602975A (en) | 1968-11-14 | 1971-09-07 | Raymond L Thurston | Helical coil insert tool |
FR2051891A5 (en) * | 1969-07-01 | 1971-04-09 | Hirigoyen Bernard | Fluoropolymer or polyamide coated - fastenings such as ferrous bolts and screws |
US4074011A (en) * | 1974-04-25 | 1978-02-14 | Nippon Steel Corporation | Topcoated phosphated bolts, nuts and washers |
JPS559566B2 (en) * | 1974-04-25 | 1980-03-11 | ||
JPS5843307B2 (en) * | 1976-02-09 | 1983-09-26 | 株式会社吉野工業所 | Biaxially stretched polygonal container |
US4645398A (en) | 1983-09-16 | 1987-02-24 | Rexnord Inc. | Tangless helically coiled insert |
US4553302A (en) | 1984-02-21 | 1985-11-19 | Rexnord Inc. | Installation tool, tangless helically coiled insert |
JPS63103008A (en) * | 1986-10-20 | 1988-05-07 | Nippon Steel Corp | Blast furnace operational method using high al2o3 ore |
US4811618A (en) * | 1986-12-12 | 1989-03-14 | Nippon Gear Co., Ltd. | Motion conversion mechanism |
JPS63175344A (en) * | 1987-01-16 | 1988-07-19 | Matsushita Electric Ind Co Ltd | Manufacture of silver oxide battery |
DE4000782A1 (en) | 1990-01-12 | 1991-08-08 | Boellhoff & Co | THREAD INSERT |
US5511510A (en) * | 1994-01-26 | 1996-04-30 | Duffy; Richard J. | Resin coated fastener and apparatus and method for manufacture of same |
-
1999
- 1999-07-20 US US09/356,988 patent/US6224311B1/en not_active Expired - Lifetime
-
2000
- 2000-07-17 JP JP2000215572A patent/JP2001059510A/en active Pending
- 2000-07-19 AT AT00306143T patent/ATE431909T1/en not_active IP Right Cessation
- 2000-07-19 EP EP00306143A patent/EP1070861B1/en not_active Expired - Lifetime
- 2000-07-19 DE DE60042228T patent/DE60042228D1/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB900672A (en) * | 1959-04-16 | 1962-07-11 | Yokohoma Rubber Company Ltd | Improved fastening assembly |
Non-Patent Citations (1)
Title |
---|
WITHFORD WORLWIDE: "XYLAN 5251 Product data sheet", 1 June 2004 (2004-06-01) * |
Also Published As
Publication number | Publication date |
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US6224311B1 (en) | 2001-05-01 |
ATE431909T1 (en) | 2009-06-15 |
EP1070861A2 (en) | 2001-01-24 |
JP2001059510A (en) | 2001-03-06 |
DE60042228D1 (en) | 2009-07-02 |
EP1070861A3 (en) | 2003-04-23 |
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